Scaffold trestle



Dec. 19, 1922., P. comm.

SCAFFOLD TRESTLE.

FILED MAR. I6, 1922.

Patented ec. I9, 1922.

T 'I E.

PERRY COLLIER, OF CONNEAUT, OHIO.

SCAFFOLD TRESTLE.

Application lled March 16, 1922.

To all whom it may concern i Be it known that I, PERRY COLLIER, acitizen of the United States, residing at Con neaut, in the county ofAshtabula and State oit Ohio, have invented certain new and usei'ulImprovements in Scatfold Trestles; and I do hereby declare the followingto be a full, clear, and exact description of the invention, such aswill enable others skilled in the art to which it appertains to make anduse the same, reference being had to the accompanying drawings, and tothe letters of reference marked thereon, forming part oi? thisspecification.

This invention relates to scaffolding, and the object thereof' is toprovide trestle mech anism therefor, which has adjustability, wherebythe vertical elevation ot the scaffold horses can be raised or loweredas may be desired.

Figure l, is a side elevation of my improved trestle mechanism showing aportion of the scaffold .et-ringer secured therein.

Figure 2, is an end elevation ot the saine.

Figure 3. is a vertical central section thereof, with portions ot themechanism broken away.

ligure il, is a top or plan View of a por-4 tion thereof.

In these drawings A indicates a trestle traine preterably made ot metal;said frame heilig preferably triangular in form as shown in Figure 2.This trame is provided with a cross bar B having holes b therethrough.Between the bar B and the apex a otl the frame A I secure a tube C. Inthe tube C I place a rod D having a Series of transverse holes a7,therethrough, adapted to receive a pin d by means of which the post orrod D is fixed at the desired elevation in the 'frame A.

@n the upper end of the post or rod D I place a U-shaped clamp E whichis provided with a hand screw c. Within the clamp E is placed atransverse stringer F upon which the scaffold boards are laid; theopposite end of the Stringer F being preferably7 pro vided with aduplicate oi' the trestle herein shown and described. G indicates abrace mechanism which is preferably provided Serial No. 544,199.

with a forked end G, the prongs g of which are adapted to enter theholes in the bar B of the frame A.

These prongs g are so designed that by raising the brace Gr to asubstantially vertical position they can be inserted into the holes Z inthe bar B oi the iframe l, and when the brace G is swung downwardly tothe position thereof shown in Figure l, said prongs are firmly locked insaid holes. The bod y of thebrace G is tubular and lirinlysecured on theforked end G thereof, and is provided with a transverse hole gtherethrough, adjacent to the upper end thereo'lI (see Fig. i) andslidably mounted in the body Gr is a telescopic extension II which isprovided with a series of transverse holes z. therethrough adapted tocoincide with the hole g and to receive the pin I-I there through, bymeans of which the extension II may be placed in adjusted position inthe body G.

lUpon the outer end of the extension II I place a U-shaped clamp J whichis provided with a screw j by means ot which said clamp is firmlysecured in place upon the Stringer F so that the trestle structure willthereby be maintained in a vertical position.

In operation the prongs g of the brace G are inserted into the holes inthe bar B oi the trestle frame fr; then the clamp E is secured upon thestringer- F and the post D is raised to the desired elevation and thepin d inserted into one or' the holes (Z in the post D to prevent saidpost from sliding downward in the frame A.

The extension I-I of the brace G is then adjusted to the desired length.and the clamp J is secured on the stringer F insuch posi* tion as tomaintain the trestle` 'frame A at suliistantially right angles to thestringer F.

Having thus shown and described my in` vention so as to enable others toconstruct and utilize the same. what I claim as new and desire to secureby Letters Patent is In a device of the class described, a substantiallytriangular frame having a ilattened top. a cross-bar to space the feetthereof apart. said cross-bar being provided with spacedapart holes inthe intermediate adapted to he inserted into the spaced-apart holes nsaid crosshar7 and clamps on the upper ends of sad'vertcal rod and said10 brace-barn testimony whereof aX my signature.

PERRY COLLIER.

